主题：编码如何生成？

If e.DataCol.Name = "产品名称" Then
    If e.DataRow.IsNull("产品名称") Then
        e.DataRow("产品编码") = Nothing
    Else
        e.DataRow("产品编码") = GetPy(e.DataRow("产品名称"))
  End If        
 Dim bh As String = Format(e.DataRow("订货日期"),"yyyyMMdd")
        If e.DataRow("订单编码").StartsWith(bh) = True
            Dim max As String
            Dim idx As Integer
            max = e.DataTable.Compute("Max(订单编码)","订货日期= #" & e.DataRow("订货日期") & "# And [_Identify] <> " & e.DataRow("_Identify"))
            If max > "" Then
                idx = CInt(max.Substring(9,3)) + 1
            Else
                idx = 1
            e.DataRow("订单编码") = bh & "-" & Format(idx,"000")
        End If
    End If
End If